1.What is a single-core shielded cable?

Single core means that there is only one conductor in an insulating layer. When the voltage exceeds 35kV, most single-core cables are used. The relationship between the core and the metal shield can be regarded as the relationship between the coil and the iron core in the primary winding of a transformer. When the core of a single-core cable passes through a current, there will be an aluminum clad or metal shielding layer with cross-linked magnetic lines, which will cause an induced voltage at its two ends.

2.Brief introduction of single-core shielded cable

According to the power safety regulations, cables with voltage levels of 35kV and below are grounded at both ends. This is because most of these cables are three-core cables. In normal operation, the sum of the currents flowing through the three cores is zero, and there is basically no flux linkage outside the aluminum clad or metal shield. In this way, there is basically no induced voltage at both ends of the aluminum clad or metal shield, so there will be no induced current flowing through the aluminum clad or metal shield after grounding at both ends. However, when the voltage exceeds 35kV, most single-core cables are used, and the relationship between the core and the metal shield can be regarded as the relationship between the coil and the iron core in the primary winding of a transformer. When the core of a single-core cable passes through a current, there will be an aluminum clad or metal shielding layer with cross-linked magnetic lines, which will cause an induced voltage at its two ends.

Power cables are generally composed of wires, insulation layers and protective layers, including single-core, double-core and triple-core cables.

Single core means that there is only one conductor in an insulating layer. If it is to be used in a single-phase lighting circuit, two conductors should be laid in parallel. Double-core means that there are two conductors in an insulating layer. If it is to be used in a single-phase lighting circuit, only one conductor should be laid. Wires can be divided into multi-strand and single-strand, soft core and hard core. According to the use conditions and power selection.